Many-body theory of spin-current driven instabilities in magnetic insulators

Roberto E. Troncoso (Corresponding author), Arne Brataas, Rembert A. Duine

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Uittreksel

We consider a magnetic insulator in contact with a normal metal. We derive a self-consistent Keldysh effective action for the magnon gas that contains the effects of magnon-magnon interactions and contact with the metal to lowest order. Self-consistent expressions for the dispersion relation, temperature, and chemical potential for magnons are derived. Based on this effective action, we study instabilities of the magnon gas that arise due to spin current flowing across the interface between the normal metal and the magnetic insulator. We find that the stability phase diagram is modified by an interference between magnon-magnon interactions and interfacial magnon-electron coupling. These effects persist at low temperatures and for thin magnetic insulators.

TaalEngels
Artikelnummer104426
Aantal pagina's10
TijdschriftPhysical Review B
Volume99
Nummer van het tijdschrift10
DOI's
StatusGepubliceerd - 22 mrt 2019

Vingerafdruk

Metals
insulators
Gases
metals
Chemical potential
gases
magnons
Phase diagrams
phase diagrams
interactions
interference
Temperature
Electrons
electrons
temperature

Citeer dit

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Many-body theory of spin-current driven instabilities in magnetic insulators. / Troncoso, Roberto E. (Corresponding author); Brataas, Arne; Duine, Rembert A.

In: Physical Review B, Vol. 99, Nr. 10, 104426, 22.03.2019.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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